naevaTheRatJul 10, 2023

Inconsistent results with auto bed levelling. Creality ender 3 s1.

https://lemmy.dbzer0.com/post/564436

Inconsistent results with auto bed levelling. Creality ender 3 s1. - Divisions by zero

See attached photo for the results of the bed levelling test using superslicer’s calibration test. This is using the uhhh mriscoc firmware after heating to thermal equilibrium, tramming to tolerance, doing a 9x9 mesh which found a high point at the super messed up bottom left corner (higher than tramming result? but slightly further out). I have M420 S1 in my custom gcode, and for insanity’s sake checked the gcode of the part and it’s in the custom block and start block. Any ideas what’s going on? every other section is okay, although back right is a bit distant.

Show threadCameronDevJul 10, 2023

How are you determining the bed is at temp? The sensor is in the middle, could the outer corners still be heating up?

Is the bed leveling actually being used? On my printer you can see the z screws move slightly as the print head moves across the board. Easiest to look at the couplers or put a text mark on the screen.

Show threadnaevaTheRat

  • waiting half an hour while I cook breakfast :p

  • I haven’t checked for motion. It would be subtle and lead screws are at the back. Will give it a squiz after gathering suggests. What do you mean text mark on the screen? I could just eyeball Z coords right as they should shift?

    • Jul 10, 2023 at 11:43pmWeb
    Show threadCameronDevJul 11, 2023

    Seems like you have worked it out, but you can usually see the z couplers on my print move about 1/4 of a turn as it moves across the bed. I usually look at the grub screws, but you could put a texta mark on the z screws to see if it was moving.

    I don’t think the Z height as reported by the printer will be moving though, it’s an internal movement.